For words that have only three letters, there isn't a 4th letter. By way of example with the word “add”, there are no more letters Later on and thus need to be the word "insert". The word “addict” is inside the BIP39 wordlist but you might have utilized “addi” for https://bookmarksurl.com/story4319167/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase